Miss Brown's father Graham wants to know what the authorities are doing to catch him.

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Graham Brown wants to know what is being done to catch his daughter's killer

Mr Brown, from Sidcup, Kent, said the Met Police's serious homicide squad had been "fantastic" in their investigation into his daughter's death but the family was "not convinced the authorities are doing everything possible" to locate Shepherd.

He contacted James Brokenshire, MP for Old Bexley and Sidcup, who helped orchestrate a meeting with the home secretary.

In a letter to Mr Brokenshire, Mr Javid said: "I would like to invite you and Charlotte's family to meet me so that I can offer them my personal assurance of the effort being made across government.

"I hope that this will go some small way towards easing the uncertainty that they must feel in these circumstances."

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Charlotte Brown and Shepherd shared two bottles of wine at dinner before the speedboat crash

Mr Brown said: "The fact that Jack Shepherd is not in custody leaves a void, and leaves the family feeling cheated.

"I don't find it credible that nobody knows where he is."

Det Insp Jo Sidaway said Shepherd was believed to be abroad and officers were continuing to work with agencies, including Interpol, to track him down.